A casualty is the damage, destruction, or loss of property resulting from an identifiable event that is sudden, unexpected, or unusual. 1  A sudden event is one that is swift, not gradual or progressive. 2  An unexpected event is one that is ordinarily unanticipated and unintended.
exists and is an alternate of . The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point onwards. The notation is shorter to write and makes it easier to identify elements.
Definition of Noble Gases. The periodic table is divided into 18 vertical columns referred to as groups or families. On the far right side of the periodic table, in group 18 is a unique group of elements known as the noble gases. The noble gases are a group of extremely nonreactive elements that all exist in the gas state. They are often considered to be inert. Inertness refers to an element's tendency to resist change and reactions.